Fragment添加ListView问题

ike_ 2017-04-19 02:50:25

楼主是个非计算机专业的苦逼大四狗，毕业设计给自己挖了个坑，开发个安卓仓库管理系统

想在Fragment中添加ListView，程序运行后，Fragment显示不出我想要的Listview，不知道问题出在哪里，求大牛指点

这是我的Fragment代码

package echo.com.wms;





import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ListView;

import android.widget.SimpleAdapter;



import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;





/**

 * Created by echo on 2017/4/17.

 */

public class InventoryManagementFragment extends Fragment{



    private String[] values = new String[] { "入库管理", "出库管理" };

    private int[] images = new int[] { R.drawable.img_putin, R.drawable.img_putout };

    @Nullable

    @Override

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_inventorymanagement, container, false);



        ListView list = (ListView)view.findViewById(R.id.listview);

        List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();

        for (int i = 0; i < values.length; i++) {

            Map<String, Object> listItem = new HashMap<String, Object>();

            listItem.put("values", values[i]);

            listItem.put("images", images[i]);

            listItems.add(listItem);

        }

        SimpleAdapter adapter = new SimpleAdapter(getActivity(), listItems,

                R.layout.fragment_inventorymanagement, new String[] { "values", "images" },

                new int[] { R.id.text_item, R.id.image_item });

        list.setAdapter(adapter);



        return view;



    }



    @Override

    public void onActivityCreated(@Nullable Bundle savedInstanceState) {

        super.onActivityCreated(savedInstanceState);





    }



}

这是我的Activity代码

package echo.com.wms;



import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;



import android.os.Bundle;



import com.ashokvarma.bottomnavigation.BottomNavigationBar;

import com.ashokvarma.bottomnavigation.BottomNavigationItem;





public class MenuActivity extends AppCompatActivity {

    private InventoryManagementFragment inventoryManagementFragment;

    private WarehouseInformationFragment warehouseInformationFragment;

    private UserInformationFragment userInformationFragment;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_menu);

        BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);

        bottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);

        bottomNavigationBar

                .setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_STATIC

                );

        bottomNavigationBar.addItem(new BottomNavigationItem(R.mipmap.ic_home_white_24dp, "库存管理").setActiveColorResource(R.color.orange))

                .addItem(new BottomNavigationItem(R.mipmap.ic_find_replace_white_24dp, "仓库信息").setActiveColorResource(R.color.green))

                .addItem(new BottomNavigationItem(R.mipmap.ic_tv_white_24dp, "用户设置").setActiveColorResource(R.color.blue))

                .setFirstSelectedPosition(0)

                .initialise();

        //设置默认页面

        setDefaultFragment();

        bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener() {

            @Override

            public void onTabSelected(int position) {//未选中 -> 选中

                FragmentManager fragmentManager = getSupportFragmentManager();

                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

                hideFragments(fragmentTransaction);

                switch (position) {

                    case 0:

// 如果fg1为空，则创建一个并添加到界面上

                        if (inventoryManagementFragment == null) {

                            inventoryManagementFragment = new InventoryManagementFragment();

                            fragmentTransaction.add(R.id.layFrame,inventoryManagementFragment);

                        } else {

// 如果不为空，则直接将它显示出来

                            fragmentTransaction.show(inventoryManagementFragment);

                        }

                        break;

                    case 1:

                        if (warehouseInformationFragment == null) {

                            warehouseInformationFragment = new WarehouseInformationFragment();

                            fragmentTransaction.add(R.id.layFrame,warehouseInformationFragment);

                        } else {

                            fragmentTransaction.show(warehouseInformationFragment);

                        }

                        break;

                    case 2:

                        if (userInformationFragment == null) {

                            userInformationFragment = new UserInformationFragment();

                            fragmentTransaction.add(R.id.layFrame,userInformationFragment);

                        } else {

                            fragmentTransaction.show(userInformationFragment);

                        }

                        break;

                }

                fragmentTransaction.commit(); // 提交

            }



            @Override

            public void onTabUnselected(int position) {//选中 -> 未选中

            }



            @Override

            public void onTabReselected(int position) {//选中 -> 选中

            }

        });





    }

    private void hideFragments(FragmentTransaction fragmentTransaction) {

        if (inventoryManagementFragment != null) {

            fragmentTransaction.hide(inventoryManagementFragment);

        }

        if (warehouseInformationFragment != null) {

            fragmentTransaction.hide(warehouseInformationFragment);

        }

        if (userInformationFragment != null) {

            fragmentTransaction.hide(userInformationFragment);

        }

    }



    //设置默认的页面

    private void setDefaultFragment() {



        FragmentManager fm = getSupportFragmentManager();

        FragmentTransaction transaction = fm.beginTransaction();

        inventoryManagementFragment = new InventoryManagementFragment();

        transaction.add(R.id.layFrame,  inventoryManagementFragment);

        transaction.commit();



    }



}